Ammonium bromide is primarily used in the photography industry as a component in the preparation of light-sensitive emulsions for photographic films and papers. It helps in controlling the sensitivity and contrast of the photographic material.

In the field of medicine, it serves as a sedative and anticonvulsant, particularly in the treatment of epilepsy and other nervous disorders. Its calming effects on the nervous system make it useful in managing certain conditions.

Additionally, it is employed in the manufacturing of fire retardants. When combined with other chemicals, it helps reduce the flammability of materials, enhancing safety in various applications such as textiles and construction.

In the laboratory, ammonium bromide is used as a reagent in chemical synthesis and analytical chemistry. It plays a role in various reactions, including the preparation of other bromine compounds.

It is also utilized in the oil and gas industry as a component in drilling fluids. It helps stabilize the drilling process and prevents the formation of gas hydrates, which can disrupt operations.